2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
10 /* The rxkad security object. Authentication using a DES-encrypted
11 * Kerberos-style ticket. These are the client-only routines. They do not
12 * make any use of DES. */
14 #include <afsconfig.h>
16 #include "afs/param.h"
18 #include <afs/param.h>
28 #ifdef AFS_LINUX20_ENV
31 #include "netinet/in.h"
33 #include "afs/sysincludes.h"
35 #ifndef AFS_LINUX22_ENV
36 #include "rpc/types.h"
42 #include <sys/types.h>
54 #include <netinet/in.h>
58 #ifdef AFS_PTHREAD_ENV
59 #include "rxkad/rxkad.h"
60 #endif /* AFS_PTHREAD_ENV */
63 #include "private_data.h"
64 #define XPRT_RXKAD_CLIENT
69 #define max(a,b) ((a) < (b)? (b) : (a))
72 static struct rx_securityOps rxkad_client_ops = {
74 rxkad_NewConnection, /* every new connection */
75 rxkad_PreparePacket, /* once per packet creation */
76 0, /* send packet (once per retrans.) */
80 rxkad_GetResponse, /* respond to challenge packet */
82 rxkad_CheckPacket, /* check data packet */
83 rxkad_DestroyConnection,
90 /* To minimize changes to epoch, we set this Cuid once, and everyone (including
91 * rxnull) uses it after that. This means that the Ksession of the first
92 * authencticated connection should be a good one. */
94 #ifdef AFS_PTHREAD_ENV
96 * This mutex protects the following global variables:
102 pthread_mutex_t rxkad_client_uid_mutex;
103 #define LOCK_CUID assert(pthread_mutex_lock(&rxkad_client_uid_mutex)==0);
104 #define UNLOCK_CUID assert(pthread_mutex_unlock(&rxkad_client_uid_mutex)==0);
108 #endif /* AFS_PTHREAD_ENV */
110 static afs_int32 Cuid[2]; /* set once and shared by all */
111 int rxkad_EpochWasSet = 0; /* TRUE => we called rx_SetEpoch */
113 /* allocate a new connetion ID in place */
114 int rxkad_AllocCID(struct rx_securityClass *aobj, struct rx_connection *aconn)
116 struct rxkad_cprivate *tcp;
117 struct rxkad_cidgen tgen;
118 static afs_int32 counter = 0; /* not used anymore */
123 tgen.ipAddr = rxi_getaddr(); /* comes back in net order */
124 clock_GetTime(&tgen.time); /* changes time1 and time2 */
125 tgen.time.sec = htonl(tgen.time.sec);
126 tgen.time.usec = htonl(tgen.time.usec);
127 tgen.counter = htonl(counter);
130 tgen.random1 = afs_random() & 0x7fffffff; /* was "80000" */
131 tgen.random2 = afs_random() & 0x7fffffff; /* was "htonl(100)" */
133 tgen.random1 = htonl(getpid());
134 tgen.random2 = htonl(100);
137 /* block is ready for encryption with session key, let's go for it. */
138 tcp = (struct rxkad_cprivate *) aobj->privateData;
139 memcpy((void *)xor, (void *)tcp->ivec, 2*sizeof(afs_int32));
140 fc_cbc_encrypt((char *) &tgen, (char *) &tgen, sizeof(tgen),
141 tcp->keysched, xor, ENCRYPT);
143 /* Create a session key so that we can encrypt it */
146 memcpy((void *)Cuid, ((char *)&tgen) + sizeof(tgen) - ENCRYPTIONBLOCKSIZE, ENCRYPTIONBLOCKSIZE);
147 Cuid[0] = (Cuid[0] & ~0x40000000) | 0x80000000;
148 Cuid[1] &= RX_CIDMASK;
149 rx_SetEpoch (Cuid[0]); /* for future rxnull connections */
157 aconn->epoch = Cuid[0];
158 aconn->cid = Cuid[1];
159 Cuid[1] += 1<<RX_CIDSHIFT;
164 /* Allocate a new client security object. Called with the encryption level,
165 * the session key and the ticket for the other side obtained from the
166 * AuthServer. Refers to export control to determine level. */
168 struct rx_securityClass *rxkad_NewClientSecurityObject(
169 rxkad_level level, struct ktc_encryptionKey *sessionkey,
170 afs_int32 kvno, int ticketLen, char *ticket)
171 { struct rx_securityClass *tsc;
172 struct rxkad_cprivate *tcp;
176 size = sizeof(struct rx_securityClass);
177 tsc = (struct rx_securityClass *) rxi_Alloc (size);
178 memset((void *)tsc, 0, size);
179 tsc->refCount = 1; /* caller gets one for free */
180 tsc->ops = &rxkad_client_ops;
182 size = sizeof(struct rxkad_cprivate);
183 tcp = (struct rxkad_cprivate *) rxi_Alloc (size);
184 memset((void *)tcp, 0, size);
185 tsc->privateData = (char *) tcp;
186 tcp->type |= rxkad_client;
188 code = fc_keysched (sessionkey, tcp->keysched);
189 if (code) return 0; /* bad key */
190 memcpy((void *)tcp->ivec, (void *)sessionkey, sizeof(tcp->ivec));
191 tcp->kvno = kvno; /* key version number */
192 tcp->ticketLen = ticketLen; /* length of ticket */
193 if (tcp->ticketLen > MAXKTCTICKETLEN) return 0; /* bad key */
194 memcpy(tcp->ticket, ticket, ticketLen);
197 rxkad_stats_clientObjects++;
202 /* client: respond to a challenge packet */
204 int rxkad_GetResponse(struct rx_securityClass *aobj,
205 struct rx_connection *aconn, struct rx_packet *apacket)
206 { struct rxkad_cprivate *tcp;
208 int v2; /* whether server is old style or v2 */
209 afs_int32 challengeID;
212 int responseSize, missing;
213 struct rxkad_v2ChallengeResponse r_v2;
214 struct rxkad_oldChallengeResponse r_old;
216 tcp = (struct rxkad_cprivate *) aobj->privateData;
218 if (!(tcp->type & rxkad_client)) return RXKADINCONSISTENCY;
220 v2 = (rx_Contiguous(apacket) > sizeof(struct rxkad_oldChallenge));
221 tp = rx_DataOf(apacket);
223 if (v2) { /* v2 challenge */
224 struct rxkad_v2Challenge *c_v2;
225 if (rx_GetDataSize(apacket) < sizeof(struct rxkad_v2Challenge))
226 return RXKADPACKETSHORT;
227 c_v2 = (struct rxkad_v2Challenge *)tp;
228 challengeID = ntohl(c_v2->challengeID);
229 level = ntohl(c_v2->level);
230 } else { /* old format challenge */
231 struct rxkad_oldChallenge *c_old;
232 if (rx_GetDataSize(apacket) < sizeof(struct rxkad_oldChallenge))
233 return RXKADPACKETSHORT;
234 c_old = (struct rxkad_oldChallenge *)tp;
235 challengeID = ntohl(c_old->challengeID);
236 level = ntohl(c_old->level);
239 if (level > tcp->level) return RXKADLEVELFAIL;
241 rxkad_stats.challenges[rxkad_LevelIndex(tcp->level)]++;
247 memset((void *)&r_v2, 0, sizeof(r_v2));
248 r_v2.version = htonl(RXKAD_CHALLENGE_PROTOCOL_VERSION);
250 (void) rxkad_SetupEndpoint (aconn, &r_v2.encrypted.endpoint);
251 (void) rxi_GetCallNumberVector (aconn, r_v2.encrypted.callNumbers);
252 for (i=0; i<RX_MAXCALLS; i++) {
253 if (r_v2.encrypted.callNumbers[i] < 0) return RXKADINCONSISTENCY;
254 r_v2.encrypted.callNumbers[i] = htonl(r_v2.encrypted.callNumbers[i]);
256 r_v2.encrypted.incChallengeID = htonl(challengeID + 1);
257 r_v2.encrypted.level = htonl((afs_int32)tcp->level);
258 r_v2.kvno = htonl(tcp->kvno);
259 r_v2.ticketLen = htonl(tcp->ticketLen);
260 r_v2.encrypted.endpoint.cksum = rxkad_CksumChallengeResponse (&r_v2);
261 memcpy((void *)xor, (void *)tcp->ivec, 2*sizeof(afs_int32));
262 fc_cbc_encrypt (&r_v2.encrypted, &r_v2.encrypted,
263 sizeof(r_v2.encrypted), tcp->keysched, xor, ENCRYPT);
264 response = (char *)&r_v2;
265 responseSize = sizeof(r_v2);
267 memset((void *)&r_old, 0, sizeof(r_old));
268 r_old.encrypted.incChallengeID = htonl(challengeID + 1);
269 r_old.encrypted.level = htonl((afs_int32)tcp->level);
270 r_old.kvno = htonl(tcp->kvno);
271 r_old.ticketLen = htonl(tcp->ticketLen);
272 fc_ecb_encrypt (&r_old.encrypted, &r_old.encrypted, tcp->keysched, ENCRYPT);
273 response = (char *)&r_old;
274 responseSize = sizeof(r_old);
277 if (RX_MAX_PACKET_DATA_SIZE < responseSize + tcp->ticketLen)
278 return RXKADPACKETSHORT; /* not enough space */
280 rx_computelen(apacket, missing);
281 missing = responseSize + tcp->ticketLen - missing;
283 if (rxi_AllocDataBuf(apacket, missing, RX_PACKET_CLASS_SEND) > 0)
284 return RXKADPACKETSHORT; /* not enough space */
286 /* copy response and ticket into packet */
287 rx_packetwrite(apacket, 0, responseSize, response);
288 rx_packetwrite(apacket, responseSize, tcp->ticketLen, tcp->ticket);
290 rx_SetDataSize (apacket, responseSize + tcp->ticketLen);
294 void rxkad_ResetState(void)